Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tAUB0dFg032741 for ; Mon, 30 Nov 2015 12:00:40 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a3M8P-0001Wi-Du for rs_out_1@blacksheep.org; Mon, 30 Nov 2015 10:56:41 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a3M8P-0001WZ-26 for rsgb_lf_group@blacksheep.org; Mon, 30 Nov 2015 10:56:41 +0000 Received: from mail-wm0-f47.google.com ([74.125.82.47]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1a3M7K-0006xC-Pe for rsgb_lf_group@blacksheep.org; Mon, 30 Nov 2015 10:56:39 +0000 Received: by wmec201 with SMTP id c201so132438325wme.1 for ; Mon, 30 Nov 2015 02:55:18 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=2z8RyYpqSU4tdfgtATUGBU3Usj7NtH7Ftg5RgQwLmyk=; b=CnZuHfZRVX0rXIxzRzVt812Aq0E5EkHiremPu7GvlZ7fYbfmAd5NBp052KzJEvq9gN SCGLj+Y8ASJo5Pwk49wIPStlUxY5ciMETDi0VKTtqg2A3pyJCS2u8/D+X75tgu7x5N6f TjABI6jK/bmvJPDlDB0a2x6QAroCD3slHwSgJNLSmfic7/JIaiR+9sPabgJYF2jxlJxO DVPmuTLKjFmux16f2EotW+a8SG39TJBVdVGOXlqtyKdJDW/P2SrCBDgfMkhkJTZuBnqf euSNGr6ZM7bkg76tFqLfoLdb3bEm2LOOa7SPfNEHs3UzqIk1QskZ53ix/vnEbSrR4pT3 4nhA== MIME-Version: 1.0 X-Received: by 10.194.87.170 with SMTP id az10mr16977970wjb.144.1448880918715; Mon, 30 Nov 2015 02:55:18 -0800 (PST) Received: by 10.28.130.139 with HTTP; Mon, 30 Nov 2015 02:55:18 -0800 (PST) In-Reply-To: References: <8D2F8A79EEF4432-1FFC-66476@webmail-vd018.sysops.aol.com> <565B3DE9.7040401@abelian.org> <565B6B1F.4070606@abelian.org> <565B70FC.1090505@abelian.org> <565B8A7B.8000608@abelian.org> Date: Mon, 30 Nov 2015 10:55:18 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: a6b6ffaf48fdddf1ed5c25dc4bf03ee1 Subject: Re: LF: More EbNaut 137.777 Content-Type: text/plain; charset=UTF-8 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 5460 The 0630 recording gave a decode too found VO1NA list rank 22 reference phase 150 150 150 150 carrier RMS 4.329e+002 noise RMS 4.617e+001 carrier S/N 19.44 dB in 976.6 uHz carrier Es/N0 -7.65 dB carrier Eb/N0 4.89 dB info bit period 35.93 seconds symbol error rate 176/512 = 34.375 % Es/N0 from symbol errors -10.9 dB Eb/N0 from symbol errors 1.4 dB Shannon capacity 411.5 bits/hour Shannon efficiency 24.4 % symbols file C:\CohLFRx\151130_0629-symbols.csv elapsed 52 seconds Andy G4JNT On 30 November 2015 at 08:37, Andy Talbot wrote: > I left it running overnight, and have tried a few capture files > selected at random. Some produce a garbage message, with symbol > errors typically 200 or so out of 512 but this one at 0200 gave a > correct decode immediately with just slightly fewer symbol errors at > 187 All the contents of the .txt file shown below > (unless the one chance in 50 ^ 5 = 315 million threw the correct > callsign up at random :-) > > One thing that puzzles me: > The EbNaut documentation states there is an outer checksum for message > validity. Why does this allow the garbage decodes to get through - > surely that must be failing the checksum. Or are they the few out > of millions of possible garbage decodes that pass the checksum > criteria? > > > Andy G4JNT > >